Applies to automatic sprinklers.

Code 3634 applies to employers engaged in manufacturing valves such as check, pressure, gate, reducing and radiator valves, engine governors, water meters and hydrants.  This classification also applies to the manufacturing of automatic sprinkler heads, soda water fountain or apparatus, water meters and other similar products.

Raw materials used are pattern lumber, molding and core sand, coke, coal, pig iron, scrap iron and brass, copper, brass, tin, lead and bronze ingots, alloys, iron, steel, copper, brass or bronze in bar, sheet or tubing, bolts, nuts, screws, gaskets, leather or rubber packings, hard rubber dials, paint, and plating solutions.

The wood is sawed, planed, jointed, turned, sanded, assembled and used in the forming of sand molds.  The metals are melted and poured into molds, cooled, castings are cleaned by tumbling, chipping, sand blasting or grinding, after which they are machined by turning, shaping, planning, boring, milling, drilling, and tapping, and some welding is also performed.  Metals for fittings and parts are cut to size, turned, drilled, milled, tapped, bored, thread, assembled with castings, buffed, polished in some cases, plated or painted, and tested.